Nox trap with improved performance

Details Nox trap with improved performance Nox trap with improved performance

1995-09-21

1998-05-12

Bos, Steven

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

4232137, 4232391, 60299, 60311, 502304, 502328, 502330, 502400, B01D 5394, B01J 2004, B01J 2302

Patent

active

057500827

ABSTRACT:
The invention is a nitrogen oxide trap separate catalyst phases. One of the phases is platinum on a porous support and another is alkali metal or elements and alkaline earth elements on another porous support. The phases may be provided as an intimate mixture or as layers in the trap. The trap may be used in an internal combustion engine exhaust gas catalyst system. During lean-burn operation of the engine the trap adsorbs nitrogen oxides and releases the nitrogen oxides during decreased oxygen concentration in the exhaust gas.

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